Nighttime chlorine monoxide observations by the Odin satellite and implications for the ClO/Cl2O2 equilibrium
Journal article, 2005

We use measurements of chlorine monoxide (ClO) by the SMR instrument onboard the Odin satellite to study the nighttime thermal equilibrium between ClO and its dimer Cl2O2. Observations performed in the polar vortex during the 2002-2003 Arctic winter showed enhanced amounts of nighttime ClO over a wide range of stratospheric temperatures (185 < T < 225 K). Odin/SMR measurements are here compared to three-dimensional model calculations using various published estimations of the K-eq equilibrium constant between ClO and Cl2O2. Our results show that the value of K-eq currently recommended by JPL (Sander et al., 2003) leads to a large underestimation of the observed nighttime ClO amounts, and that a realistic estimation of K-eq must lie between the values determined by Cox and Hayman (1988) and Von Hobe et al. (2005).

Author

G. Berthet

Institut Pierre Simon Laplace Ecole polytechnique

University of Cambridge

P. Ricaud

Laboratoire dAerologie UMR 5560

F. Lefévre

Institut Pierre Simon Laplace Ecole polytechnique

E. Le Flochmoën

Laboratoire dAerologie UMR 5560

Joachim Urban

Chalmers, Department of Radio and Space Science, Global Environmental Measurements

B. Barret

Laboratoire dAerologie UMR 5560

N. Lautié

Chalmers

E. Dupuy

Observatoire Aquitain des Sciences de l'Univers, OASU

J. De La Noë

Observatoire Aquitain des Sciences de l'Univers, OASU

Donal Murtagh

Chalmers, Department of Radio and Space Science, Global Environmental Measurements

Geophysical Research Letters

0094-8276 (ISSN)

Vol. 32 11 1-5

Subject Categories

Meteorology and Atmospheric Sciences

DOI

10.1029/2005GL022649

More information

Latest update

9/10/2018